The experiment shows that proper amounts of exercise, if regularly, can improve
来源：网络
时间：
推荐文章
The experiment shows that proper amounts of exercise, if regularly, can improve our health.
| A．being carried out | B．carried out |
| C．carrying out | D．to carry out |
试题答案
B
解析这题考查if条件句的省略式，如果主从句的主语一样，可以省略从句中的主语和be动词。If carried out="if" the experiment is carried out..,句意是：这个实验表明，适当的锻炼，如果定期实施，对健康是有利的。选B。